Coffee machine



FIG. 1 is a front view of the coffee machine;

FIG. 2 is a left side view of the coffee machine;

FIG. 3 is a right side view of the coffee machine;

FIG. 4 is a back view of the coffee machine;

FIG. 5 is a top view of the coffee machine; and,

FIG. 6 is a bottom view of the coffee machine. 

The ornamental design for a coffee machine, as shown and described. 